There are many uses of similar triangles in daily life. These triangles can create the symmetry in art and other aspects that they enjoy.
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Most of the time, you don't use calculus or other types of advanced math in your daily life, unless "daily life" specifically involves working in some engineering branch, teaching advanced math, or something similar.
Triangles do not have parallel lines but as right angles triangles they do have perpendicular lines that meet at 90 degrees.
Architecture, Mechanics, constrcution
Its simply as this. The only way you would use right triangles in real life if you would want to become a math teacher.
daily life use in geomatry